/*
 * Copyright the original author or authors.
 * 
 * Licensed under the MOZILLA PUBLIC LICENSE, Version 1.1 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *	  http://www.mozilla.org/MPL/MPL-1.1.html
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.googlecode.milib.tools {
	import com.googlecode.milib.base.MLBaseClass;

	public class Averager extends MLBaseClass {

		private var history : Array;
		private var sum : uint;
		public var lengthLimit:uint;
		private var average : Number;
		private var isNewAverage : Boolean;
		
		public function Averager(lengthLimit:uint=15) {
			this.lengthLimit=lengthLimit;
			history=[];
			sum=0;
			isNewAverage=true;
			average=1;
		}//<>
		
		public function push(num:Number):void {
			history.push(num);
			sum+=num;
			while(history.length>lengthLimit){
				sum-=Number(history.shift());
			}
			isNewAverage=false;
		}
		
		public function getAverage():Number {
			if(!isNewAverage){ average=sum/history.length; isNewAverage=true; }
			return average;
		}
		
		public function getAddedRecently():Number {
			return history[history.length-1];
		}
		
	}
}